try {

            Class.forName("com.mysql.jdbc.Driver");
             conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/definit", "root", "");

            String report = "C:\\Users\\fredy\\Documents\\javareport\\src\\javareport\\report1.jrxml";
            HashMap hashMap = new HashMap();
            JasperReport jasperReport = JasperCompileManager.compileReport(report);
            JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, null, conn);
           JasperViewer.viewReport(jasperPrint);
           conn.close();

        } catch (Exception e) {
           JOptionPane.showMessageDialog(null, e.getMessage());
        }